CN104393767B - Double active bridge circuit based dual-mode current-current converter and control device thereof - Google Patents
Double active bridge circuit based dual-mode current-current converter and control device thereof Download PDFInfo
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- CN104393767B CN104393767B CN201410795961.6A CN201410795961A CN104393767B CN 104393767 B CN104393767 B CN 104393767B CN 201410795961 A CN201410795961 A CN 201410795961A CN 104393767 B CN104393767 B CN 104393767B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention discloses a double active bridge circuit based dual-mode current-current converter and a control device thereof. The double active bridge circuit based dual-mode current-current converter comprises an input power supply, a first active bridge circuit, a relay first switch, a buffer inductor, a high-frequency transformer, a relay second switch, a second active bridge circuit and an output filter capacitor. The control device comprises a voltage sensor, a current sensor and a DSP (digital signal processor) digital controller, wherein the DSP digital controller comprises a converter work mode controller, an output voltage adjustment ring, a Flyback mode signal modulator, a DAB mode signal modulator and a signal selective switch. If loading current is higher, the converter works in a DAB mode, double active bridges are arranged on circuits of a primary side and an auxiliary side of the transformer, and output voltage is controlled through phase shift; if the loading current is smaller, the converter works in a Flyback mode, and output voltage is controlled through control of PWM (pulse-width modulation) of a switching tube. The converter can obtain higher efficiency under different power condition by means of different work modes.
Description
Technical field
The present invention relates to a kind of double mode DC-DC converter and its control device based on double active bridge circuits, category
In converters and its control technology field.
Background technology
The exhaustion of fossil energy forces people to find suitable alternative, free of contamination regenerative resource, photovoltaic cell and
Development is the swiftest and the most violent at present for Wind turbines.In renewable energy power generation fermentation, the power output of separate unit Wind turbines is constantly improve,
5MW is reached at present；And photovoltaic cell is carried out into serial or parallel connection can also reach larger power output, high-power output
Energy processed using separate unit power inverter, it is possible to achieve conversion efficiency higher.But also occur in that one thereupon
A little problems, for photovoltaic cell, it is impossible to ensure that every piece of photovoltaic cell is all consistent to the incident angle of sunshine, or part light
Volt battery is blocked by the shade of cloud layer, building, and this cannot ensure that every piece of photovoltaic cell is all operated in respective maximum work
On rate point, the efficiency of system is directly affects, reduce the profit of Power Generation.
It is reply above mentioned problem, in recent years, an important research direction of regenerative resource, particularly photovoltaic generation is micro-
Inverter, i.e., every piece photovoltaic cell (power is generally 150-250W) is equipped with a micro- inverter module, is directly installed on photovoltaic
The back side of cell panel.Under normal circumstances, in order that monolithic photovoltaic cell generates electricity, pressure energy is enough realized grid-connected, and micro- inverter is all used
Multiple power levels are converted, i.e., have one-level DC/DC converters before combining inverter, and the DC/DC converters can either realize photovoltaic electric
The MPPT maximum power point tracking in pond, can be lifted to relatively low photovoltaic cell output voltage again can realize grid-connected voltage class.
Photovoltaic cell among one day, the non-constant width of excursion of its power output, and generally, DC/DC conversion
Device has a power bracket for adaptation, and such as anti exciting converter is suitable for tens watts of power conversion, and full-bridge converter is adapted to
In the power conversion of several hectowatts to several kilowatts, thus be difficult a kind of converter of selection can be in low-power, and simultaneously in high power
All obtain conversion efficiency higher.Hence set up a kind of converter all obtained in the range of power conversion wide compared with high conversion efficiency
Development, reduction cost of electricity-generating, the profit of raising operator and enthusiasm to promoting renewable energy power generation have energetically anticipates
Justice.
Therefore, find and be adapted to the converter and its corresponding control strategy of width power conversion scope, ensure transformation of electrical energy
High efficiency, it is main task of the invention by the stable operation of digit chip control realization whole system.
The content of the invention
Goal of the invention：Peak power output for photovoltaic cell changes this spy with the change of light radiation intensity
Property, realize treatment photovoltaic cell generate electricity energy converter can be realized in the range of processing power wider efficiently.Due to
The power output of photovoltaic cell is violent, the frequency of wide fluctuations is not especially high, therefore can be by lossless relay switch
Some of cut-out/input converter element, so that the work of the application different topology under different capacity is realized, to ensure conversion
Device is all realized efficient in power bracket wider.
Technical scheme：
A kind of double mode DC-DC converter based on double active bridge circuits, including input power, the first active bridge electricity
Road, relay first switch, buffer inductance, high frequency transformer, relay second switch, the second active bridge circuit, output filtering
Electric capacity and load resistance.Wherein first active bridge circuit includes the first switch pipe with anti-paralleled diode, second switch pipe, the
Three switching tubes, the 4th switching tube, the source electrode of first switch pipe and the 3rd switching tube drain electrode connection, the source electrode of second switch pipe and
The drain electrode connection of the 4th switching tube, and draining for first switch pipe connects the drain electrode of second switch pipe, the source electrode of the 3rd switching tube
Connect the source electrode of the 4th switching tube；The positive input terminal of input power is connected to the drain electrode of first switch pipe and the leakage of second switch pipe
Between pole, the negative input end of input power is connected between the source electrode of the 3rd switching tube and the source electrode of the 4th switching tube.It is described after
Electrical equipment first switch, its first terminal is connected between the drain electrode of the source electrode of first switch pipe and the 3rd switching tube；
The third terminal connection of one end and relay first switch of the buffer inductance；
The second active bridge circuit includes the 5th switching tube with anti-paralleled diode, the 6th switching tube, the 7th switch
Pipe, the 8th switching tube, the source electrode of the 5th switching tube are connected with the drain electrode of the 7th switching tube, and the source electrode of the 6th switching tube is opened with the 8th
The drain electrode connection of pipe is closed, and the drain electrode of the 5th switching tube is connected with the first terminal of relay second switch, the 6th switching tube
Drain electrode is connected with the third terminal of relay second switch, and the source electrode of the 7th switching tube connects the source electrode of the 8th switching tube；Relay
The Second terminal of device second switch is hanging.
The high frequency transformer include the first primary side winding, the second primary side winding and vice-side winding, wherein the first primary side around
The Same Name of Ends of group is connected with the other end of buffer inductance, and the different name end of the first primary side winding is then with the second of relay first switch
Terminal is connected, and the different name end of the second primary side winding is connected between the drain electrode of the source electrode of second switch pipe and the 4th switching tube；It is secondary
The Same Name of Ends of side winding is connected between the source electrode of the 5th switching tube and the drain electrode of the 7th switching tube, and the different name end of vice-side winding connects
It is connected between the source electrode of the 6th switching tube and the drain electrode of the 8th switching tube；
One end of the output filter capacitor is connected to the drain electrode of the 6th switching tube and the 3rd end of relay second switch
Between son, and it is connected with one end of load resistance；The other end of output filter capacitor be connected to the source electrode of the 7th switching tube with
Between the source electrode of the 8th switching tube, and it is connected with the other end of load resistance.
The numerical control device of the double mode DC-DC converter based on double active bridge circuits, including voltage sensor,
Current sensor and DSP digitial controllers, wherein DSP digitial controllers include converter mode of operation controller, output electricity
Pressure regulation ring, Flyback mode signals modulator, DAB mode signals modulator, signal selecting switch；
The input of voltage sensor is connected to the two ends of load resistance, input and the load resistance string of current sensor
Connection；
Converter mode of operation selection control includes fixed value signal generator, first comparator and mode selector,
Wherein, the positive input of comparator terminates the output end of current sensor, the negative input termination fixed value signal hair of first comparator
The output end of raw device, the output end of first comparator is connected with the input of mode selector, the first output of mode selector
It is Flyback patterns to hold, and the second output end is DAB patterns；
Output voltage regulation ring includes subtracter and output voltage regulator, wherein, the positive input termination output of subtracter
Voltage reference value, the negative input end of subtracter connects the output end of above-mentioned voltage sensor, the output termination output voltage of subtracter
The input of adjuster；
Flyback mode signals modulator includes that clock-signal generator, timer, zero-signal generator, second are compared
Device, rest-set flip-flop, the 3rd signal manifold, wherein, the output end of the B input termination clock-signal generators of timer, timing
The R input of device connects the output end of the second comparator, the positive input terminal of T output second comparators of termination of timer；Second ratio
It is connected with the output end of output voltage regulator compared with the negative input end of device, the output end of the second comparator is defeated with the R of rest-set flip-flop
Enter end connection, the S inputs of rest-set flip-flop are connected with the output end of clock-signal generator, the output end Q of rest-set flip-flop connects the
One input of three signal manifolds, the output end of another input connecting to neutral signal generator of the 3rd signal manifold；
DAB mode signals modulator includes PWM signal generator, phase inverter, the first signal manifold, phase shifter, second
Signal manifold, wherein, the input of phase inverter is connected with the output end of PWM signal generator, the output end of phase inverter and the
One the second input of signal manifold is connected, and the first signal manifold first input end connects with the output end of PWM signal generator
Connect, the output end of the first signal manifold is connected with an input of secondary signal manifold, phase shifter first input end with
The output end connection of output voltage regulator, the input of phase shifter second is connected with the output end of the first signal manifold, phase shift
Device output end is connected with another input of secondary signal manifold；
Signal selecting switch is a three ends numeral single-pole double-throw switch (SPDT), and the Second terminal of signal selecting switch connects
The output end of the 3rd signal manifold in Flyback mode signal modulators, the third terminal of signal selecting switch connects DAB patterns
The output end of secondary signal manifold in signal modulator, the first terminal output first switch pipe, second of signal selecting switch
The drive of switching tube, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube
Dynamic signal.
A kind of digital control method of the double mode DC-DC converter based on double active bridge circuits, including following step
Suddenly：
The output voltage for controlling the double mode DC-DC converter based on double active bridge circuits by output-voltage loop is protected
Hold in steady state value；Load current is detected by current sensor, the output power range of converter is judged.If converter is exported
Power works in DAB patterns more than the critical value for setting, converter, and the first terminal of relay first switch connects its 3rd end
Son, the first terminal of relay second switch connects its third terminal, and inverter main circuit is the structure of double active bridges, signal choosing
The first terminal for selecting switch connects its third terminal, and the switching tube drive signal in converter is produced by DAB mode signals modulator
It is raw；If converter power output works in Flyback patterns, relay first switch less than the critical value of setting, converter
The first terminal connect its Second terminal, the first terminal of relay second switch connects its Second terminal, inverter main circuit
It is double-transistor flyback converter, the first terminal of signal selecting switch connects its Second terminal, the switching tube in converter drives letter
Number by Flyback mode signals modulator produce；
In Flyback mode signal modulators, peak value comparison method is realized using digital method, and be provided without electric current
Sensor detects primary side current of transformer, and timer is started by clock signal, when the clocking value of timer exceedes output
During the output signal of voltage regulator, the second comparator exports high level signal to turn off the first switch Guan Yu in main circuit
Four switching tubes, the magnetic energy of transformer is transferred in secondary coil；At the same time, the second comparator output signal is to timer
Resetted.The timing again of timer will again arrive the moment when clock signal.Above procedure, completely and analog chip
The Peak-current Controlled anti exciting converter of control is consistent.
Beneficial effect：After such scheme, the present invention determines converter by converter mode of operation selection control
Mode of operation.When power output is smaller, converter works in Flyback patterns, and the structure of converter is the change of double-transistor flyback formula
Parallel operation；When power output is larger, converter works in DAB patterns, and the structure of converter is double active bridging parallel operations.So,
High efficiency can be realized in converter can be ensured from underloading to fully loaded power bracket wider.Flyback is worked in converter
During pattern, without detection primary side current of transformer, and peak value comparison method mode is simulated using timer, both realized conversion
The steady operation of device, reduces system cost again.
Brief description of the drawings
Fig. 1 is the double mode DC-DC converter and its control dress based on double active bridge circuits of the embodiment of the present invention
Put block diagram；
Fig. 2 is main circuit diagram of the embodiment of the present invention in DAB patterns；
Fig. 3 is the embodiment of the present invention one main waveform diagram of switch periods in DAB patterns；
Fig. 4 is main circuit diagram of the embodiment of the present invention in Flyback patterns；
Fig. 5 is the embodiment of the present invention one main waveform diagram of switch periods in Flyback patterns；
Fig. 6 is the equivalent circuit diagram of embodiment of the present invention mode 1 in Flyback patterns；
Fig. 7 is the equivalent circuit diagram of embodiment of the present invention mode 2 in Flyback patterns；
Fig. 8 is the equivalent circuit diagram of embodiment of the present invention mode 3 in Flyback patterns；
Fig. 9 is the equivalent circuit diagram of embodiment of the present invention mode 4 in Flyback patterns；
Designation in figure：Uin--- input supply voltage；S1-S8 --- the switching tubes of first switch Guan Zhi eight；L——
Buffer inductance；T --- high frequency transformer；KA_1 --- relay first switch；KA_2 --- relay second switch；uAB——
First active bridge AC voltage；uCD--- the second active bridge AC voltage；iW1--- primary side current of transformer；iDA——
Primary side current of transformer during DAB patterns；iFb--- primary side current of transformer during Flyback patterns；iW2--- transformer secondary electricity
Stream；Co--- converter output filter capacitor；Uo--- converter output voltage；Io--- converter output current；Io_f——
The corresponding feedback signal of converter output current；R --- converter load resistance；Uo* --- converter output voltage a reference value
Signal；Uo_f--- the corresponding feedback signal of converter output voltage；Uo_e--- converter output voltage regulation ring error signal；
Uo_r--- converter output voltage modulated signal；Io_th--- converter output current threshold signal；um--- converter works
Mode select signal；uclk--- clock-signal generator output signal；uT--- timer output signal；ure--- RS is triggered
Device reset signal；uS1c~uS4c--- the 3rd transition drive signal of switching tube S1~S4；uS1b~uS8b--- switching tube S1~
The second transition drive signal of S8；uS1a~uS8a--- the First Transition drive signal of switching tube S1~S8；uS1d~uS8d——
The 4th transition drive signal of switching tube S1~S8；uS1e~uS8e--- the 5th transition drive signal of switching tube S1~S8；uS1
~uS8--- the drive signal of switching tube S1~S8.
Specific embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention, after the present invention has been read, those skilled in the art are to various equivalences of the invention
The modification of form falls within the application appended claims limited range.
As shown in figure 1,
A kind of double mode DC-DC converter based on double active bridge circuits, including input power Uin, the first active bridge
Circuit, relay first switch KA_1, buffer inductance L, high frequency transformer T, relay second switch KA_2, the second active bridge electricity
Road, output filter capacitor CoWith load resistance R, below put up with its interconnected relationship and building block is described in detail.
First active bridge circuit includes the first switch pipe S1 with anti-paralleled diode, second switch pipe S2, the 3rd switch
Pipe S3, the 4th switching tube S4, the drain electrode connection of the source electrode and S3 of S1, the drain electrode connection of the source electrode and S4 of S2, and the drain electrode of S1 connect
The drain electrode of S2 is connect, the source electrode of S3 connects the source electrode of S4；UinPositive input terminal be connected between the drain electrode of S1 and the drain electrode of S2, Uin
Negative input end be connected between the source electrode of S3 and the source electrode of S4.The first terminal of KA_1 is connected to the source electrode of S1 and the drain electrode of S3
Between；
The third terminal connection of one end and KA_1 of buffer inductance L；
The second active bridge circuit includes the 5th switching tube S5, the 6th switching tube S6, the 7th with anti-paralleled diode
Switching tube S7, the 8th switching tube S8, the source electrode of S5 are connected with the drain electrode of S7, and the source electrode of S6 is connected with the drain electrode of S8, and S5 leakage
Pole is connected with the first terminal of KA_2, and the drain electrode of S6 is connected with the third terminal of KA_2, and the source electrode of S7 connects the source electrode of S8；KA_2
Second terminal it is hanging；
High frequency transformer T includes the first primary side winding W11, the second primary side winding W12With vice-side winding W2, wherein W11It is same
Name end is connected with the other end of L, W11Different name end be then connected with the Second terminal of KA_1, W12Different name end be connected to the source of S2
Between pole and the drain electrode of S4；W2Same Name of Ends be connected between the source electrode of S5 and the drain electrode of S7, W2Different name end be connected to the source of S6
Between pole and the drain electrode of S8；
Converter output filter capacitor CoOne end be connected between the drain electrode of S6 and the third terminal of KA_2, and and R
One end connection；CoThe other end be connected between the source electrode of S7 and the source electrode of S8, and be connected with the other end of R.
The numerical control device of the double mode DC-DC converter based on double active bridge circuits, including voltage sensor,
Current sensor and DSP digitial controllers, wherein DSP digitial controllers include converter mode of operation controller, output electricity
Pressure regulation ring, Flyback mode signals modulator, DAB mode signals modulator, signal selecting switch；
The input of voltage sensor is connected to the two ends of R, and the input of current sensor is connected with R；
Converter mode of operation selection control includes fixed value signal generator, first comparator and mode selector,
Wherein, the positive input of comparator terminates the output signal I of current sensoro_f, the negative input termination fixed value letter of first comparator
The output signal I of number generatoro_th, the output end signal u of first comparatormIt is connected to the input of mode selector, pattern choosing
The first output end of device is selected for Flyback patterns, the second output end is DAB patterns；
Output voltage regulation ring includes subtracter and output voltage regulator, wherein, the positive input termination output of subtracter
Voltage reference signal Uo*, the negative input end of subtracter connects the output signal U of above-mentioned voltage sensoro_f, the output letter of subtracter
Number be Uo_e, by signal Uo_eThe input of output voltage regulator is connect, the output signal of voltage regulator is Uo_r；
Flyback mode signals modulator includes that clock-signal generator, timer, zero-signal generator, second are compared
Device, rest-set flip-flop, the 3rd signal manifold, wherein, the output signal u of the B input termination clock-signal generators of timerclk,
The T output signals u of timerTIt is connected to the positive input terminal of the second comparator；Signal Uo_rIt is connected to the negative input of the second comparator
End, the output signal of the second comparator is ure, by signal ureIt is connected to the R inputs of the R input and rest-set flip-flop of timer
End connection, the output signal u of the S input termination clock-signal generators of rest-set flip-flopclk, the output termination the 3rd of rest-set flip-flop
One input of signal manifold, the output end of another input connecting to neutral signal generator of the 3rd signal manifold；
DAB mode signals modulator includes PWM signal generator, phase inverter, the first signal manifold, phase shifter, second
Signal manifold, wherein, the input of phase inverter is connected with the output end of PWM signal generator, the output end of phase inverter and the
One the second input of signal manifold is connected, and the first signal manifold first input end connects with the output end of PWM signal generator
Connect, the output end of the first signal manifold is connected with an input of secondary signal manifold, phase shifter first input end with
The output end connection of output voltage regulator, the input of phase shifter second is connected with the output end of the first signal manifold, phase shift
Device output end is connected with another input of secondary signal manifold；
Signal selecting switch K1 is a three ends numeral single-pole double-throw switch (SPDT), and the Second terminal of K1 connects Flyback patterns letter
The output end of the 3rd signal manifold in number modulator, secondary signal is converged during the third terminal of K1 connects DAB mode signal modulators
The output end of storage, the first terminal of K1 exports 8 road signals, respectively as the driving letter of S1, S2, S3, S4, S5, S6, S7 and S8
Number.
During present invention work, the double mode DC-dc conversion based on double active bridge circuits is controlled by output-voltage loop
The output voltage U of deviceoIt is maintained at steady state value；Load current I is detected by current sensoroSize, judge the output of converter
Power bracket.If converter power output works in DAB patterns, the first end of KA_1 more than the critical value of setting, converter
Son connects its third terminal, and the first terminal of KA_2 connects its third terminal, and inverter main circuit is the structure of double active bridges, such as
Shown in Fig. 2, at the same time, the first terminal of signal selecting switch K1 connects its third terminal, and the switching tube in converter drives
Signal is produced by DAB mode signals modulator；If converter power output is worked in less than the critical value of setting, converter
Flyback patterns, the first terminal of KA_1 connects its Second terminal, and the first terminal of KA_2 connects its Second terminal, converter
Main circuit is double-transistor flyback converter, and the first terminal of K1 connects its Second terminal, the switching tube drive signal in converter by
Flyback mode signals modulator is produced；
In Flyback mode signal modulators, peak value comparison method is realized using digital method, and be provided without electric current
Sensor detects primary side current of transformer, and timer is started by clock signal, when the clocking value of timer exceedes output
During the output signal of voltage regulator, the second comparator exports high level signal to turn off the first switch Guan Yu in main circuit
Four switching tubes, the magnetic energy of transformer is transferred in secondary coil；At the same time, the second comparator output signal is to timer
Resetted.The timing again of timer will again arrive the moment when clock signal.Above procedure, completely and analog chip
The Peak-current Controlled anti exciting converter of control is consistent.
Fig. 2 show converter corresponding main circuit in DAB patterns, it can be seen that transformer primary side and secondary circuit
Active full-bridge circuit is, in DSP digitial controllers, the first active bridge and second is generated using DAB mode signals modulator
The drive signal of active bridge circuit breaker in middle pipe, specific waveform is as shown in Figure 3.From figure 3, it can be seen that the first active bridge AC
Voltage is uAB, the second active bridge AC voltage is uCD, DAB mode signals modulator output switching tube drive signal cause
Voltage uABPhase leading voltage uCD, in this way, energy flows to load-side from input side.Primary side current of transformer iW1Situation have many
Kind, primary side current of transformer i shown in Fig. 3W1It is efficiency highest situation.Operational modal analysis about double active bridging parallel operations can
Can be inquired about with various kinds of document, and this is not emphasis of the invention, therefore to the model analysis of double active bridge phase shifting controls not
Illustrate.
Fig. 4 is converter corresponding main circuit in Flyback patterns, it can be seen that except switching tube S1 and S4 need
Beyond high-frequency drive, all in cut-off state, its corresponding drive circuit does not work remaining 6 switching tube, saves big portion
The driving power divided, and now the overall power of converter is smaller, the driving power saved is carried to converter whole efficiency
Height has positive effect；Work of transformation device is double-transistor flyback circuit during along with Flyback patterns, there is voltage clamp circuit will change
Depressor leakage inductance energy is fed back to the features such as obtaining Zero Current Switch under input power, discontinuous conduct mode, therefore, it is smaller processing
Power when, converter can still obtain conversion efficiency higher.When Fig. 5 gives consideration transformer primary side leakage inductance, a switch
Main waveform in cycle.As can be seen that point 4 operation modes in a switch periods, difference corresponding diagram 6 to Fig. 9.
Switch mode 1 [corresponding diagram 6]：
t0Only have output filter capacitor before moment, in converter to be powered to load resistance, all there there is no remainder in circuit
Electric current flows through.t0At the moment, switching tube S1 and S4 are opened, input power is acted directly on transformer primary side winding, transformer primary
Electric current gradually increases in the winding of side, due to the cut-off of switching tube S6 and S7 anti-paralleled diode, therefore nothing in transformer secondary winding
Electric current, during the increased electric current of primary side is stored in transformer core in the form of the magnetic energy.
Switch mode 2 [corresponding diagram 7]：
t1Moment, on-off switching tube S1 and S4, transformer storage electric energy stops increasing, due to having cut off primary side exciting curent
Path, therefore exciting curent is transferred to the secondary of transformer, forces the anti-paralleled diode of switching tube S6 and S7 to turn on, transformation
The energy transfer stored in device is in output filter capacitor and load resistance.In the primary side side of transformer, due to transformer primary side
The effect of leakage inductance, after switching tube S1 and S4 shut-off, the energy of the storage in leakage inductance can be by the inverse parallel of switching tube S2 and S3
Diode feeds back to input power, and due to voltage spikes will not be produced on switching tube.It is smaller due to storing energy in leakage inductance, because
This switch corresponding time period of mode 2 is very short.
Switch mode 3 [corresponding diagram 8]：
t2Moment, the energy stored in transformer primary side leakage inductance discharges completely, the anti-paralleled diode of switching tube S2 and S3
Cut-off, no current in transformer primary side circuit；Current flowing situation in transformer secondary circuit is with switch mode 2.
Switch mode 4 [corresponding diagram 9]：
t3Moment, the energy stored in transformer discharges completely, now, the anti-paralleled diode nature of switching tube S6 and S7
Shut-off, current flowing situation and t in circuit0Consistent before moment, i.e., only output filter capacitor is powered to load resistance.
t4After moment, next switch periods start, and repeat t0-t4The course of work.
The principle of Flyback pattern work of transformation devices is can be seen that with single switch flyback code converter from above-mentioned analysis process.
In sum, the present invention realizes the working in double modes of double active bridging parallel operations using relay switch, according to conversion
The power output of device determines that converter works in DAB patterns or Flyback patterns, during DAB patterns, converter power output compared with
Greatly, and during Flyback patterns, the power output of converter is smaller, therefore, converter can be real in power bracket wider
Efficiency now higher.When converter works in Flyback patterns, without detection primary side current of transformer, and timer is used
Peak value comparison method mode is simulated, the steady operation of converter has both been realized, system cost is reduced again.Therefore, the present invention
Converter has the advantages that low cost, efficiency high.
Claims (2)
1. a kind of numerical control device of the double mode DC-DC converter based on double active bridge circuits, it is characterised in that double
Mode dc-DC converter：Including input power, the first active bridge circuit, relay first switch, buffer inductance, high frequency
Transformer, relay second switch, the second active bridge circuit, output filter capacitor and load resistance；Wherein first active bridge electricity
Road includes the first switch pipe with anti-paralleled diode, second switch pipe, the 3rd switching tube and the 4th switching tube, first switch pipe
Source electrode and the 3rd switching tube drain electrode connection, the drain electrode connection of the source electrode of second switch pipe and the 4th switching tube, and first open
The drain electrode of the drain electrode connection second switch pipe of pipe is closed, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube；Input power
Positive input terminal be connected between the drain electrode of first switch pipe and the drain electrode of second switch pipe, the connection of the negative input end of input power
Between the source electrode of the 3rd switching tube and the source electrode of the 4th switching tube；The relay first switch, its first terminal is connected to
Between the drain electrode of the source electrode of first switch pipe and the 3rd switching tube；
The third terminal connection of one end and relay first switch of the buffer inductance；
The second active bridge circuit include the 5th switching tube with anti-paralleled diode, the 6th switching tube, the 7th switching tube and
8th switching tube, the source electrode of the 5th switching tube is connected with the drain electrode of the 7th switching tube, and the source electrode of the 6th switching tube and the 8th is switched
The drain electrode of pipe is connected, and the drain electrode of the 5th switching tube is connected with the first terminal of relay second switch, the leakage of the 6th switching tube
Pole is connected with the third terminal of relay second switch, and the source electrode of the 7th switching tube connects the source electrode of the 8th switching tube；Relay
The Second terminal of second switch is hanging；
The high frequency transformer includes the first primary side winding, the second primary side winding and vice-side winding, wherein the first primary side winding
Same Name of Ends is connected with the other end of buffer inductance, the different name end of the first primary side winding then with the Second terminal of relay first switch
Connection, the different name end of the second primary side winding is connected between the drain electrode of the source electrode of second switch pipe and the 4th switching tube；Secondary around
The Same Name of Ends of group is connected between the source electrode of the 5th switching tube and the drain electrode of the 7th switching tube, and the different name end of vice-side winding is connected to
Between the drain electrode of the source electrode and the 8th switching tube of the 6th switching tube；
One end of the output filter capacitor be connected to the drain electrode of the 6th switching tube and relay second switch third terminal it
Between, and be connected with one end of load resistance；The other end of output filter capacitor is connected to the source electrode and the 8th of the 7th switching tube
Between the source electrode of switching tube, and it is connected with the other end of load resistance；
Numerical control device：Including voltage sensor, current sensor and DSP digitial controllers, wherein DSP digitial controllers
Including converter mode of operation controller, output voltage regulation ring, Flyback mode signals modulator, the modulation of DAB mode signals
Device, signal selecting switch；
The input of voltage sensor is connected to the two ends of load resistance, and the input of current sensor is connected with load resistance；
Converter mode of operation selection control includes fixed value signal generator, first comparator and mode selector, wherein,
The positive input of comparator terminates the output end of current sensor, the negative input termination fixed value signal generator of first comparator
Output end, the output end of first comparator is connected with the input of mode selector, and the first output end of mode selector is
Flyback patterns, the second output end is DAB patterns；
Output voltage regulation ring includes subtracter and output voltage regulator, wherein, the positive input termination output voltage of subtracter
A reference value, the negative input end of subtracter connects the output end of above-mentioned voltage sensor, the output termination output voltage regulation of subtracter
The input of device；
Flyback mode signals modulator includes clock-signal generator, timer, zero-signal generator, the second comparator, RS
Trigger and the 3rd signal manifold, wherein, the output end of the B input termination clock-signal generators of timer, the R of timer
The output end of input the second comparator of termination, the positive input terminal of T output second comparators of termination of timer；Second comparator
Negative input end is connected with the output end of output voltage regulator, and the output end of the second comparator connects with the R input of rest-set flip-flop
Connect, the S inputs of rest-set flip-flop are connected with the output end of clock-signal generator, the output end Q of rest-set flip-flop connects the 3rd signal
One input of manifold, the output end of another input connecting to neutral signal generator of the 3rd signal manifold；
DAB mode signals modulator includes PWM signal generator, phase inverter, the first signal manifold, phase shifter and secondary signal
Manifold, wherein, the input of phase inverter is connected with the output end of PWM signal generator, and the output end of phase inverter is believed with first
Number input of manifold second connection, the first signal manifold first input end is connected with the output end of PWM signal generator, the
The output end of one signal manifold is connected with an input of secondary signal manifold, and phase shifter first input end is electric with output
The output end connection of adjuster is pressed, the input of phase shifter second is connected with the output end of the first signal manifold, phase shifter output
End is connected with another input of secondary signal manifold；
Signal selecting switch is a three ends numeral single-pole double-throw switch (SPDT), and the Second terminal of signal selecting switch connects Flyback moulds
The output end of the 3rd signal manifold in formula signal modulator, the third terminal of signal selecting switch connects the modulation of DAB mode signals
The output end of secondary signal manifold in device, the first terminal output first switch pipe of signal selecting switch, second switch pipe, the
The drive signal of three switching tubes, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube.
2. a kind of double mode DC-DC converter based on double active bridge circuits as claimed in claim 1 is digital control
The implementation method of device, it is characterised in that comprise the following steps：
The output voltage for controlling the double mode DC-DC converter based on double active bridge circuits by output-voltage loop is maintained at
Steady state value；Load current is detected by current sensor, the output power range of converter is judged；If converter power output
More than the critical value of setting, converter works in DAB patterns, and the first terminal of relay first switch connects its third terminal,
The first terminal of relay second switch connects its third terminal, and inverter main circuit is the structure of double active bridges, signal behavior
The first terminal of switch connects its third terminal, and the switching tube drive signal in converter is produced by DAB mode signals modulator；
If critical value of the converter power output less than setting, converter works in Flyback patterns, the of relay first switch
One terminal connects its Second terminal, and the first terminal of relay second switch connects its Second terminal, and inverter main circuit is double
Pipe anti exciting converter, the first terminal of signal selecting switch connects its Second terminal, the switching tube drive signal in converter by
Flyback mode signals modulator is produced；In Flyback mode signal modulators, peak point current is realized using digital method
Control, and current sensor detection primary side current of transformer is provided without, timer is started by clock signal, work as timing
When the clocking value of device exceedes the output signal of output voltage regulator, the second comparator exports high level signal to turn off main circuit
In the switching tubes of first switch Guan Yu tetra-, the magnetic energy of transformer is transferred in secondary coil；At the same time, second compares
Device output signal resets to timer；The timing again of timer will again arrive the moment when clock signal；More than
The peak value comparison method process that digital method is realized, the Peak-current Controlled anti exciting converter one for being controlled with analog chip completely
Cause.
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| CN201410795961.6A CN104393767B (en) | 2014-12-18 | 2014-12-18 | Double active bridge circuit based dual-mode current-current converter and control device thereof |
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| CN105811460B (en) * | 2016-05-04 | 2019-10-25 | 中车株洲电力机车研究所有限公司 | A kind of power module high frequency test system for electronic power transformer |
| CN107425236B (en) * | 2017-06-15 | 2019-12-17 | 西安电子工程研究所 | Filtering integrated single-pole double-throw switch and microstrip line filtering integrated single-pole double-throw switch |
| CN107241021A (en) * | 2017-08-03 | 2017-10-10 | 上海交通大学 | DAB converters global optimization closed loop control method under a kind of triple phase shifting controls |
| US10574129B2 (en) * | 2018-05-04 | 2020-02-25 | Raytheon Company | System and method for adaptively controlling a reconfigurable power converter |
| CN110649819B (en) * | 2019-10-16 | 2021-06-01 | 艾尚储能科技(苏州)有限公司 | Closed-loop control method of double-active full-bridge direct-current converter based on DSP |
| CN110797948B (en) * | 2019-11-18 | 2021-10-08 | 深圳市群芯科创电子有限公司 | Fast charging control circuit |
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| CN201490890U (en) * | 2009-09-01 | 2010-05-26 | 上海惠桑电源技术有限公司 | Converter capable of working in phase-shift resonance and PWM modes |
| US8587975B2 (en) * | 2010-04-01 | 2013-11-19 | Arizona Board Of Regents For And On Behalf Of Arizona State University | PWM control of dual active bridge converters |
| KR20140063923A (en) * | 2012-11-19 | 2014-05-28 | 주식회사 한썸 | Soft switching device of dab converter at light load |
| CN103199707A (en) * | 2013-03-19 | 2013-07-10 | 北京交通大学 | Method for controlling drive pulses of DAB type bidirectional isolation DC-DC converter |
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